Rock-drill.



Patented Dec. I6, |902.

F. coma.

BUCK DRILL.

(Application led Feb. 24, 1902.)

(No Model.)

Exam/y Effe- UNITED STATES Armar OFFICE.

FRANK COYLE, OF GRANITEVILLE, VERMONT, ASSIGNOR OF ONE-HALF TO NELSON B. BALLARD, OF BARRE, VERMONT.

Rock-DRILL.

SPECIFICATION forming part 0f Letters Patent N0. 715,993, dated December 16, 1902. Application filed February 24| 1902. Serial No. 95,249. (No model.)

To @ZZ whom, t nutty concern,.-

Be it known that I, FRANK COYLE, a citizen of the United States, residing at Graniteville, in the county of Washington and State 5 of Vermont, have invented certain new and useful Improvements in Rock-Drills; and I do declare the following to be a full, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use the same.

The invention relates to rock-drills, and

more particularly to a chuck for the plunger` of a steam, hydraulic, or pneumatic piston.

The object of the invention is to provide a chuck of this character which may be readily adapted for holding a drill or reamer and which shall be simple of construction,durable" in use, and comparatively inexpensive of production.

With these and other objects in view, which will readily appear as the nature of the invention is better understood, the same consists in certain novel features of construction and combination and arrangement of parts,

as will be hereinaft er fully described, deiined in the appended claims,a`nd illustrated in th accompanying drawings, in which- Figure l is a vertical sectional View of a chuck, showing it attached to the lower end of the piston of a steam, hydraulic, or pneumatic drill.

Referring more Fig. 2 is atop pla'n View.

particularly to the drawto the piston.

The cap is interiorly screwthreaded to engage the exterior threads at the upper end of the chuck-body, and a set-screw 6a is employed to prevent the accidental unscrewing of said cap.

9 denotes a bushing arranged within the chuck-body and acted upon by the chuck-bolt and nuts to firmly secure the shank of the tool to the chuck. by the numeral 10.

The tool-shank is denoted The upper portion of the Yformed with a registering recess 16.

chuck-body is formed with a chamber 11 to receive the head 2 of the pistonand the lower end of this piston seats upon a tempered ring 12, connected by screws 13 to the shoulder 14 of the chamber. The chuck-body is formed inits side about midway its length with a transverse opening 15, and the drill-head is 17 denotes a plate bolted to the chuck-body over said opening, and 1S denotes a gib movable within the opening and into the recess and ,swiveled to the inner end of a screw 19, which works through a screw-threaded aperture 20, formed in said plate, and is provided with a jam or set nut 21.

In the class of rock-drillsinwhich the present invention is intended for usein drilling through a rock-means are provided for constantly rotating the piston while it is being reciprocated. It is therefore essential that the chuck be locked to the piston, so that the drill-tool will be likewise rotated. By setting the gib into the recess of the piston-head and jamming the set-nut tight said chuck will be securely locked to the piston, and the piston will thus be prevented from turning independently of the chuck.

From the foregoing description, taken in connection with the accompanying drawings, itis thought that the construction, operation, and advantages of my improved rock-drill will be readily apparent without requiring a more extendedexplanation.

Various changesin the form, proportion, and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

Having thus described my invention, what I claim as new,and desire to secure by Letters Patent, is-

1. The combination with a piston,of a chuck, means for loosely connecting the chuck to the piston to permit of the rotary movement of one with respect to the other, means carried by the chuck for fixedly clamping a toolin position, a gib, and a screw for actuating the gib and locking the chuck to the piston, substantially as set forth.

2. A chuck of the character described hav- IOO my hand in presence of two subscribing witmesses.

ing a, transverse aperture in its Wall, a. plate covering said aperture, a gib slidably m ounted in said aperture, and ascrew Working through said plate to lock the gib to or unlock it from l 5 the piston to which the chuck is adapted to Vitnesses:

FRANK COYLE.

FRANK S. VVILLIAMs, F. C. Goss.

be connected, substantially as described.

In testimony whereof I have hereunto set 

